Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Seasonal Variation of Water Temperature Before and After Weir Construction Using Satellite Image in the Nakdong River

낙동강유역에서 위성영상을 이용한 보 건설 전후 수온의 계절변화

  • Kim, Sang-Woo (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute) ;
  • Kim, Hae-Dong (Department of Global Environment Keimyung University) ;
  • Lim, Jin-Wook (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute) ;
  • Ahn, Ji-Suk (Oceanic Climate and Ecology Research Division, NFIS)
  • 김상우 (동해수산연구소 자원환경과) ;
  • 김해동 (계명대학교 지구환경학부) ;
  • 임진욱 (동해수산연구소 자원환경과) ;
  • 안지숙 (국립수산과학원 기후변화연구과)
  • Received : 2015.08.24
  • Accepted : 2015.10.15
  • Published : 2015.11.30
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Abstract

In this study we were to explore the seasonal variation of water temperature distributions before and after weir construction at Gumi, Chilgok, Gangjung(Goryung), Dalsung in the Nakdong River using Landsat satellite images. Relationship between in-situ water temperature and radiance values of Landsat-5, 7, 8 satellite images showed high correlation. Seasonal variation of water temperature in Nakdong River showed that the fluctuation ranges of water temperature before weir construction were larger than those after weir construction. This indicated that the variation of water temperature is due to the difference of heat storage volume by weir construction and dredging work. In particular, the water temperature after weirs construction in autumn was 4-8 times lower than that before weirs construction. Water temperature after weir construction decreased in spring and summer at the downstream of Gumi weir and Gangjung(Goryung) weir, and the upstream of Dalsung weir. In autumn and winter, the water temperature after weir construction increased in the upstream and downstream of the whole weirs except upstream of Gumi weir. Relationship between water temperature and meteorological elements (air temperature, wind speed, sunshine, radiation) showed high correlation of above 94% in air temperature, and then radiation was high correlation before and after 65%.

Keywords

References

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